PLATE VIII. 



Dorsal and caudal vertebrae of Mylodon robustus, half the natural size. 



Fig. ] . Front view of the eighth dorsal vertebra. 

 Fig. 2. Side view of the eighth dorsal vertebra. 

 Fig. 3. Upper view of the eighth dorsal vertebra. 



Fig. 4. Under view of the eighth dorsal vertebra. 



a. Anterior costal articular surface. 



b. Posterior costal articular surface. 



c. Superior costal articular surface on the transverse process. 



d. Anterior articular processes. 



e. Posterior articular processes. 



Fig. 5. Hinder surface of the tirst caudal vertebra. 

 a. HEemapophysial articular surfaces. 

 6. These letters are placed on the posterior articular surfaces of the 



hsemapophyses, or inferior vertebral plates, which remain ununited 



in the first caudal vertebra, 

 e. Posterior articular processes of the neurapophyses, here united as 



in ordinary cases to form the superior or neural arch. 



Fig. 6. Front view of the neural arch of the first caudal vertebra. 

 d. Anterior articular processes. 



Fig. 7. Upper surface of the first caudal vertebra. 



d. Anterior articular processes of the neural arch. 



e. Posterior articular processes of the neural arch. 



Fig. 8. Under surface of the second caudal vertebrse. 



a, a. Posterior haemapophysial articulations : the anterior articulations 

 are on the opposite angles of the square surface of the body, which 

 likewise shows the two vascular foramina. 



